My mom still lives in a “socialist cube” that was built in the late 70’s in Finland (and they’re literally the same kind of design; we actually exported concrete elements to eg. the DDR and others for building more socialist cubes).

The building’s exterior has been renovated over the years, the windows were redone at one point, the balconies were all torn down and rebuilt, it’s been painted, etc etc. It’s still affordable to live in even after all that, and it actually looks nice too. And the floor plan is actually meant for humans to live in unlike 99% of modern developments in Finland which are meant to produce the maximum amount of income for some giant construction conglomerate, so the apartments end up eg. being shaped like long tubes with one window at the end, or with the entry being in the kitchen.